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post #2 of (permalink) Old 3rd May 2006
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The 'pre heater circuit' is the glow plugs.On a common rail diesel the glow plugs aren't used very much,so you wouldn't know wether they're working or not.These won't cause your problem,though.

The 'intake air circuit' fault,I'm not sure about.It may be a turbo boost fault,or any other number of faults,but this,I suspect,is the one causing your problems.

What scanner did your mechanic friend use?

I'd rather push my Alfa than drive a BMW....
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